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// Portions Copyright [2019-2021] [Payara Foundation and/or its affiliates]
package org.glassfish.connectors.config.validators;

import org.glassfish.connectors.config.ConnectorConnectionPool;
import com.sun.enterprise.config.serverbeans.ResourcePool;

import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorContext;
import org.glassfish.config.support.Constants;

/**
 * Implementation for Connection Pool validation.
 * Following validations are done:
 * <ul>
 * <li>Validation of datasource/driver classnames when resource type is not null
 * <li>Max pool size to be always higher than steady pool size
 * <li>Check if statement wrapping is on when certain features are enabled.
 * </ul>
 *
 * @author Shalini M
 */
public class ConnectionPoolValidator implements ConstraintValidator<ConnectionPoolConstraint, ResourcePool> {

    protected ConnectionPoolErrorMessages poolFaults;


    @Override
    public void initialize(final ConnectionPoolConstraint constraint) {
        this.poolFaults = constraint.value();
    }


    @Override
    public boolean isValid(final ResourcePool pool, final ConstraintValidatorContext constraintValidatorContext) {
        if (!ConnectorConnectionPool.class.isInstance(pool)) {
            return true;
        }
        final ConnectorConnectionPool connPool = (ConnectorConnectionPool) pool;
        if (poolFaults == ConnectionPoolErrorMessages.POOL_SIZE_STEADY) {
            return getSteadyPoolSize(connPool) >= 0;
        } else if (poolFaults == ConnectionPoolErrorMessages.POOL_SIZE_MAX) {
            final int steadyPoolSize = getSteadyPoolSize(connPool);
            final int maxPoolSize = getMaxPoolSize(connPool);
            return maxPoolSize > 0 && maxPoolSize >= steadyPoolSize;
        }
        return true;
    }


    private int getSteadyPoolSize(ConnectorConnectionPool pool) {
        return toInt(pool.getSteadyPoolSize(), Constants.DEFAULT_STEADY_POOL_SIZE);
    }


    private int getMaxPoolSize(final ConnectorConnectionPool pool) {
        return toInt(pool.getMaxPoolSize(), Constants.DEFAULT_MAX_POOL_SIZE);
    }


    private int toInt(final String valueToParse, final String defaultValue) {
        if (valueToParse == null) {
            return Integer.parseInt(defaultValue);
        }
        return Integer.parseInt(valueToParse);
    }
}
